Double-action piston rod



Aug. 21, 1945. R. c. LAURAIN DOUBLE ACTION PISTON ROD Fil ed July 20. 19,45 2 sheets-sheet 1 Ina/2mm Aug. 21, 1945. c, 2,383,136

DOUBLE ACTION PISTON ROD Filed July 20, 1943' 2 Sheets-Sheet 2 am 5*," z 777.3. I: ll/

Inventor 1 9 0 lawr-azwl [8a 24mm...

l Patented Aug. 21, 1945 resins i UNETED STATES PATEN T QFFII'JIE.

DOUBLE-ACTION ms'ron ROD Roy 0. Laurain, Deal-born, Mich, ApplicationJnly 20, 1943. Serial No. 495,503

1 Claim,

Thi invention relates tonew and useful imcially adapted for use on radial engines, but which can be used for other types of engines as well.

An important object of the present invention is to provide a piston constructed in yieldabie sections and adapted to operate unyieldingly to a point Just below the burning point oi fuel where to the utmost point in the companion cylinder to completely expel burnt gases,

Other objects and advantages of the invenfollowing description.

In the drawingsisure ton rod.

Figure 2 is a front elevational view of the rod. Figure 3 is an enlarge longitudinal sectional view taken on the line 3-4 of Figure 2. Figure 4 is a cross section on the line I-I of Figure 2.

Figure 5 is an end elevational view looking at the inner end of the rod section.

Figure 6 is a section on the line I-I of FigureI.

Figure 'I is a fragmentary side elevation showing how the rod is connected to a radial engine master ring. J

' tion will become apparent the reader of ,the

1 is a side elevationalview of the pisr it will yield, but which upon scavenging operation will function to move the corresponding piston Oil ducts II, R extend downwardly from the bearing I and through the rod section I to the barrel II and a duct or ducts 2I serve to communicate the bearing II- with the interior of the barrel Il. e

As will be seen. the described piston rod is adapted to be extended by the springs l3 and ,the spring I I functioning to cushion and limit extension of the same. on the down, intake stroke, the piston rod descends fully extended. On the compression, up stroke, it ascends fully extended until the compression. overcomes the springs II, II, and Just before full compression, said rod contracts allowing the crank shaft, not shown, to attain vertical center while the said rod is contracted and without the piston, not shown, passing from compression position. .On the power-stroke, the piston rod descends contracted. On the exhaust, up stroke. said rod ascends extended, so that the piston is forced into the compression space or chamber, not shown, to scavenge the same. 0n the power. down stroke.

the spring II acts as asupplemental means for cushioning the rod section I against the force of the'explosion.

Figure 7 shows how a rod constructed as above Q is connected with a master ring II of a radial englue. Numeral II generally refers to the fixed rod or such an engine and this fixed rod is con- Referring to; the drawings wherein like numerals designate like parts, it can be seen that numeral I denotes a rod section having anupper threaded end I disposed into a socket 1 'carried by a. wrist Din bearing I. the latter having a liner I.

The other end of the rod section I hasa head the head II on the rod-section I is a weakercom- V pressionspring II.

Numeral II denotes a compression spring which is stronger than the'spring ll but substantially weaker than the spring II and this spring II is interposed between the head II of the rod section I and the distal end of the barrel II; The

latter end ofthe barrel II has amaster rod or crankshaft bearingi'i in whicnthe liner II is 65 structed in accordance with the present invention.

While the foregoing specification sets forth the invention in specific terms, it is is to be understood that numerous changes in the shape. size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the Inventiomwhat is claimed as new is: V e

A piston rod structure comprising a barrel having a bushing at one'end thereof, a rod slidably disposed in the bushing and rovided at one end with a head in the barrel. a bearing at the other end of the rod, a compression spring interposed between the bearing and'thebushing. and

means in the barrel acting on said head comprising a spring interposed between the bushing and the headof the rod and weaker than the 'first-mentionedspring. and a sprihsin m between the head andthe other end'of the barrel weaker than the first-mentioned spring and stronger than the second-mentioned spring.

no? c. muasnz. 

